This domain is found in a number proteins including Rhophilin Swiss:Q61085 and BRO1 Swiss:P48582. It is known to have a role in endosomal targeting. ESCRT-III subunit Snf7 binds to a conserved hydrophobic patch in the BRO1 domain that is required for protein complex formation and for the protein-sorting function of BRO1 [2].

1: HD-PTP: A novel protein tyrosine phosphatase gene on human chromosome 3p21.3. Toyooka S, Ouchida M, Jitsumori Y, Tsukuda K, Sakai A, Nakamura A, Shimizu N, Shimizu K; Biochem Biophys Res Commun 2000;278:671-678. PMID:11095967

2: Structural basis for endosomal targeting by the Bro1 domain. Kim J, Sitaraman S, Hierro A, Beach BM, Odorizzi G, Hurley JH; Dev Cell 2005;8:937-947. PMID:15935782